Calling Generic OpenCV methods from Android with opencv-android
I installed the opencv-android plugin successfully and I can build and run the cvcamera sample application as well. I have the opencv project included in eclipse as a library project as well. However, I'm confused about how to execute arbitrary opencv methods from within my android application.
For instance, I have my application take a picture and save it. Then, I want to have opencv load that image so I can run some processing on it. As a first step, I'm trying to load that image into an opencv Mat. So, I created the following class based on the code I see in the cvcamera sample:
import com.opencv.jni.Mat;
public class ExtraOpencvJNI {
static {
try {
System.loadLibrary("android-opencv");
} catch (UnsatisfiedLinkError e) {
throw e;
开发者_JAVA技巧 }
}
public final static native Mat imread(String jarg1);
}
Then, within my android java code I try to execute:
Mat img = ExtraOpencvJNI.imread("<path_to_img>");
However, I get an UnsatisfiedLinkError: imread when I execute the above java code. I know I must be misunderstanding something fundamental about how the opencv-android library works, but I can't find anything else out there explaining how to call basic opencv functions using the android library. What steps am I overlooking?
You could try JavaCV instead, it does just that:
http://code.google.com/p/javacv/
You need to have a corresponding imread bit of code in the JNI files (.i). For example, in the cvcamera example, there is processor.i and some others. As far as i can remember, I haven't seen imread on there. You're supposed to use the given methods, which move the YUV images from androids camera into a pool for processing by code written in c++.
That should not be a problem. I can do imread in my app. My guess is that you forgot to
#include <opencv2/highgui/highgui.hpp>
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